<template>
  <div>
     <ul>
        <li v-for="(item,index) in arr" :key="index">
          <span>{{item}}</span>
          <button @click="del(index)">删除</button>
        </li>
     </ul>
     <button @click="add">生成</button>
  </div>
</template>

<script>
export default {
  data(){
   return{
     arr:[1,5,3]
   }
  },
  methods: {
    add(){
      this.arr.push(Math.floor(Math.random() * 20));
    },
    del(index){
      this.arr.splice(index,1)
    }
  }
}
</script>

<style>

</style>